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Connecting to Clickhouse is very straightforward. You just need to provide the connection string and credentials. If you are using something like Clickhouse Cloud, you can find the connection string in the UI.
Clickhouse Cloud Connection String
If you are making connection credentials just for GrowthBook, you can give it read-only access to the database. If you use GrowthBook Cloud and the destination is behind a firewall, allow inbound traffic from 52.70.79.40/32. That is the only address GrowthBook Cloud connects out from — see IP addresses.